const person = {
  name:'Lisa',
  age:20
}
const personProxy = new Proxy(person,{
  get(target,property){
    return property in target?target[property]:'default'
    // console.log(target,property)
    // return 100
  },
  set(target,property,value){
    target[property] = value
  }
})
console.log(personProxy.name)